| Official Name: | Illinois Township |
| Settlement Type: | Township |
| Pushpin Map: | Arkansas |
| Pushpin Map Caption: | Location in Arkansas |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Pope |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 54.33 |
| Area Land Sq Mi: | 48.29 |
| Area Water Sq Mi: | 6.04 |
| Area Water Percent: | 11.12 |
| Population As Of: | 2010 |
| Population Total: | 29,813 |
| Population Density Sq Mi: | 617.4 |
| Elevation Ft: | 351 |
| Coordinates: | 35.2833°N -93.1294°W |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Postal Code Type: | Zip codes |
| Postal Code: | 72801, 72802, 72811, 72812, 72858 |
| Area Code: | 479 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 69707 |
Illinois Township is one of nineteen current townships in Pope County, Arkansas, USA.[1] As of the 2010 census, its total population was 29,813, with 91.8 percent (approx. 27,370 people) contained in urban Russellville.[1]
According to the United States Census Bureau, Illinois Township covers an area of 54.33sqmi, with 48.29sqmi of it land and 6.04sqmi of water.
The township contains Lake Dardanelle and Lake Dardanelle State Park.